Musannaf Ibn Abi Shayba 3:5034

Yazid ibn Harun narrated to us, he said: Humayd al-Tawil informed us, from Thabit, who said: Anas took my hand. He began to walk slowly toward the prayer, then he turned to me and said: "This is how Zayd ibn Thabit used to do, so that his steps would be many."